Thomson Broadcast and Multimedia ULT-1K10K2 UHF Digital transmitter, for use with MediaFlo User Manual PREIMPAP
Thomson Broadcast & Multimedia, Inc. UHF Digital transmitter, for use with MediaFlo PREIMPAP
Contents
Operation manual part 2
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| Document ID | 690681 |
| Application ID | nHX02M5ukCzO96pWiHHkRw== |
| Document Description | Operation manual part 2 |
| Short Term Confidential | No |
| Permanent Confidential | No |
| Supercede | No |
| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 141.73kB (1771648 bits) |
| Date Submitted | 2006-08-07 00:00:00 |
| Date Available | 2006-10-12 00:00:00 |
| Creation Date | 2006-07-07 13:09:08 |
| Producing Software | Acrobat Distiller 6.0 (Windows) |
| Document Lastmod | 2006-07-07 13:09:23 |
| Document Title | PREIMPAP.DOC |
| Document Creator | Acrobat PDFMaker 6.0 pour Word |
| Document Author: | TBM |
Digital Liquid Cooled UHF TV Equipment Description / Test points / Location of units 3.2.3.1. Digital board Topography ref.1 ♦ This version is designed upon FPGA hardware and is dedicated to MediaFLO. ♦ The serial incoming data stream signal is processed by the channel encoder, which provides an output complex digital signal in the form of parallel I and Q digital signals and a clock reference. ♦ The channel encoder has a hardware version allowing to perform MediaFLO modulation. ♦ The equipment can support redundant switching input for MediaFLO operation. The equipment will also be able to manage SFN operation. Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON. ♦ An embedded microprocessor will manage daughter boards such as GPS (optional) OEM receiver, and TS Board. ♦ RS232, I2C and SPI buses are used for internal control and monitoring of the daughter boards. ♦ External Control and Monitoring is done through RS232 and/or Ethernet and/or CAN bus. ♦ The digital board is distributing pilot clocks to SIRIUS boards. 10MHz to the synthesizer and TS board and system clock to the TS board. 3.2.3.2. TS board Topography ref.2 ♦ The TS board received from the digital board the outputs I&Q signals and clock reference. These I&Q signals are processed by the TS board which includes : Clipping, Linear Equalization, Non Linear adaptive pre-correction. ♦ The Clipping function limits the magnitude of the vector above a given threshold. The magnitudes higher than the threshold are replaced by the threshold complex value. ♦ The non linear automatic pre-correction function computes the best shoulder level at the output of the transmitter. The process is based on a LUT (Look Up Table) that is loaded from an iterative measurement of the shoulder level. The complex base band outputs of the LUT is then upconverted to the IF frequency. ♦ The complex IF frequency signals are converted in the analog domain, filtered,(Rep. 4) transposed and amplified to UHF band (Rep. 6 and 7) ♦ Tx Board (Rep. 3) A daughter board is fitted on the TS board in order to do the up conversion function. External feedback which is coming from the RF signal at the output of the transmitter is used in order to control the shoulder, the linear correction process. ♦ Feedback signals are then processed by the TS board via the switch/ALE card (Rep. 5) achieves an automatic change over from the both signals (ALE-IN and FDB-IN) to the TS card input. 3.2.3.3. Power supply Topography ref.8 and 8A ♦ A specific power supply is used for the whole cabinet to supply +12volts, -12 volts, +5 volts and + 3,3 volts. 9946 V1 45321648.01 Numéro / Number 104 Doc. preliminary Rev. Langu. 16/06/2006 43 / 131 Page Digital Liquid Cooled UHF TV Equipment Description / Test points / Location of units 3.2.3.4. Synthesizer Topography ref.7 ♦ A digital programmable synthesizer is provided to deliver a sinusoidal signal at the transmitting frequency between 430 and 900 MHz with an output level of 10 dBm / 50 ohms. 3.2.3.5. GPS receiver Topography ref.12 ♦ This low power miniature board GPS enable to get the 1 pps signal 10 µs pulse, UTC, 10 MHz. Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON. 3.2.3.6. Miscellaneous The frame of the exciter included one complementary device : ♦ An LED board for front panel indications. ( Rep. 3) 3.2.3.7. 3.2.3.7.1. Input processing SFN System For the SFN network the input module plays another role. Stuffing locally is just not possible, as all transmitters have to radiate the same information at the same time. A transport stream that supports SFN differs from the MFN transport stream by including the pps and flo frames data signal. The Mega frame structure corresponds to 8 COFDM frames in the 8k mode, 16 frames in 4k mode. The SFN input module must be able to receive external synchronizaton signals, frequency reference and timing signals from a common reference, e.g. a GPS signals. 3.2.3.8. Control of timing In an SFN application, the control of timing from input to output of the COFDM exciter is extremely important, like the ability of the COFDM exciter to synchronize in frequency and time to an external reference. 9946 V1 45321648.01 Numéro / Number 104 Doc. preliminary Rev. Langu. 16/06/2006 44 / 131 Page Digital Liquid Cooled UHF TV Equipment Description / Test points / Location of units 3.2.4. Encoding ♦ Network : SFN ♦ Channelization : 6MHz ♦ Transmission modes : 12 ♦ Local network and Wide network supported Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON. ♦ MediaFloTM Logical Channel supported 9946 V1 45321648.01 Numéro / Number 104 Doc. preliminary Rev. Langu. 16/06/2006 45 / 131 Page Digital Liquid Cooled UHF TV Equipment Description / Test points / Location of units 3.2.5. Transport Stream Inputs Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON. The Sirius is provided with two serial (ASI) inputs. The active input is selected either via the front panel or the remote control. The input accepts an MPEG transport stream according to the MPEG and MediaFLo recommendations. Both 188 and 204 byte transport packets are supported. 9946 V1 45321648.01 Numéro / Number 104 Doc. preliminary Rev. Langu. 16/06/2006 46 / 131 Page Digital Liquid Cooled UHF TV Equipment Description / Test points / Location of units 3.2.6. Adaptive non linear pre-correction Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON. The adaptive precorrection algorithm computes automatically the amplitude distribution from the non linear feedback input. Both “one shot” and “adaptive” mechanisms are available. In adaptive mode, when shoulders after power amplification are above a threshold, the exciter computes new set of coefficients. This system allows the best optimisation of the shoulder and MER after the transmitter (estimated to be 1dB better than manual adjustment). Moreover, the algorithm balances the shoulder to have the best output performance. 9946 V1 45321648.01 Numéro / Number 104 Doc. preliminary Rev. Langu. 16/06/2006 47 / 131 Page Digital Liquid Cooled UHF TV Equipment Description / Test points / Location of units 3.2.7. Adaptive linear correction Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON. The adaptive linear correction function allows to compute a digital 64-tap filter to compensate combiner filter. The 64-tap linear corrector allows to compensate typical 12 pole elliptic filter (typ. tilt 6dB and typ. Group delay 2.5uS). 9946 V1 45321648.01 Numéro / Number 104 Doc. preliminary Rev. Langu. 16/06/2006 48 / 131 Page Digital Liquid Cooled UHF TV Equipment Description / Test points / Location of units 3.2.8. Alarm circuits A RS232 connector allows to have 2 isolated inputs and two isolated outputs. In typical application, when the exciter is sued to control amplifier system, these inputs can be used as GO/NO GO in case of amplification failure. Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON. The two outputs can be used also to reset the power amplification system or to trig other equipment. 9946 V1 45321648.01 Numéro / Number 104 Doc. preliminary Rev. Langu. 16/06/2006 49 / 131 Page Digital Liquid Cooled UHF TV Equipment Description / Test points / Location of units 3.2.9. Frequency references The exciter is equipped with an internal frequency reference with stability of ± 4ppm, adequate for many applications including multi frequency applications. Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON. The user can either use the internal GPS receiver or an external GPS reference. The smart engine is designed to avoid any frequency jump at RF output. The frequency reference can either be the internal GPS or external 1pps signal or external 10MHz. When SFN is used, the pps signal is mandatory during the initialization phase. 9946 V1 45321648.01 Numéro / Number 104 Doc. preliminary Rev. Langu. 16/06/2006 50 / 131 Page Digital Liquid Cooled UHF TV Equipment Description / Test points / Location of units 3.2.10. Interface of exciter 3.2.10.1. Front panel Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON. A1 06/024(e-f) Figure 10 : Front panel (04/271(f-e)) The following appear on the SIRIUS module front panel: DIAGRAM REFERENCE COMPONENT Red fault LED Red ALARM LED REMARKS Overall hardware fault ♦ Lit: indicates that one of the boards in the Sirius module is faulty ♦ Extinguished: normal operation MPEG or GPS signals at input (10 MHZ and 1 PPS) ♦ Extinguished: operational ♦ Lit: indicates that one of the input signals is absent. In SFN mode, the inputs taken into account are: ♦ ASI 1 ♦ ASI 2 ♦ 10 Mhz ♦ 1 P.P.S. 9946 V1 45321648.01 Numéro / Number 104 Doc. preliminary Rev. Langu. 16/06/2006 51 / 131 Page Digital Liquid Cooled UHF TV Equipment Description / Test points / Location of units DIAGRAM REFERENCE COMPONENT Green OK LED REMARKS This LED has two functions: ♦ Extinguished: software fault ♦ Lit: indicates that the microprocessor is operating satisfactorily (software) Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON. Note: During the made the powered-on of exciter, the LED “OK” is lit during approximately 15 seconds indicating the operated of power supply then, put out (extinct) during approximately 7 seconds indicating the starting-up of the microprocessor and to end lit. (refer to the diagram below). 3.2.10.1.1. Test Points The RF output signal from the SIRIUS module can be monitored at connector A on the front of the module. The RF output signal from the synthesiser unit (LO) can be monitored at connector A1 on the front panel of the SIRIUS rack. 3.2.10.1.2. Front panel interconnections The following appear on the SIRIUS module front panel: DIAGRAM REFERENCE COMPONENT REMARKS COM 1 Connector Reserved for TBM use: Serial link connection (RS232); this enables authorised personnel to have access to the digital card micro program (Modulator). The user must not connect anything to this connector. LAN Connector Reserved for TBM use: Ethernet link connection (RJ45) with digital card (Modulator). This connection is limited to factory use and gives access to high level functions and fault finding routines in the Sirius module (for use by a technician using a terminal) PC card reader On the right hand side of the SIRIUS front panel there is a PC card reader which will accept a memory card on which the exciter parameters can be stored (not available) 9946 V1 45321648.01 Numéro / Number 104 Doc. preliminary Rev. Langu. 16/06/2006 52 / 131 Page Digital Liquid Cooled UHF TV Equipment Description / Test points / Location of units 3.2.10.2. Connection at the rear side of the exciter 06/096(e-f) Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON. At the back side of the exciter are located all the necessary customer inter connexion to assume the driver function in the transmitter. 9946 V1 45321648.01 Numéro / Number 104 Doc. preliminary Rev. Langu. 16/06/2006 53 / 131 Page Digital Liquid Cooled UHF TV Equipment Description / Test points / Location of units Main power supply input :90 to 254 volts AC, 47 to 63 hertz 2 RJ45 connexions for ethernet and ethernet TS information in connexion with the digital board. 10 MHz 50 ohms frequency reference input connected to digital board Timing reference 1 pps connected to digital board External GPS input Double input and double output opto coupled ports in connexion with digital board DB9 RS232 UTC reference input for GPS DB9 RS232 Local CM in connexion with digital board. DB9 RS232 data for digital board. Can bus in connexion with digital board Low priority DVB-ASI input TS High priority DVB ASI input TS Automatic gain control input VSWR input in connexion to TS board Feedback RF input for linear automatic correction Feedback RF input (-15dBm+/5dB) no linear automatic correction. 0 dBm with 45dB shoulder RF output DB9 Double input and double output opto coupled ports in connexion with switch/ALE board Optional ASI output 06/097(e-f) Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON. LEFT SIDE OF THE RACK 06/098(e-f) MIDDLE SIDE OF THE RACK 06/099(e-f) RIGHT SIDE OF THE RACK 9946 V1 45321648.01 Numéro / Number 104 Doc. preliminary Rev. Langu. 16/06/2006 54 / 131 Page Digital Liquid Cooled UHF TV Equipment Description / Test points / Location of units 3.2.11. General characteristics 3.2.11.1. Pre-correction The pre-corrector option supports non-linear pre-correction (gain and phases vs power level) and linear pre-correction (level and group delay response vs. frequency). The pre-corrector allows further control of the peak power clip level (range + 17dB to +7dB peak power relative to average RMS level). Non-linear correction: Information contained is this document is confidential, is THOMSON property and cannot be disclosed in whatever form without prior written authorization of THOMSON. ♦ Gain correction: Max 12dB, subject to available headroom ♦ Phase correction: -6 to +30 degrees, subject to available headroom Linear correction: ♦ Correction points: 64 ♦ Point spacing: 1/20 of nominal spectrum BW ♦ Amplitude correction: ±10dB ♦ Amplitude resolution: 0.01dB ♦ Group delay correction: ±2000ns ♦ Group delay resolution: 1ns 3.2.11.2. General Electrical Mechanical and Cooling Characteristics Rack : 19” 1U desired, 2U max, depth 600-4dBm) - overdrive (over current or power protection system activated and fault stored : 45 A for 4 double transistors), - P input > -4 to -3dBm and P output <250W - SWR protection system activated and fault stored (≥ 2 ), - thermal protection system activated and fault stored (air input temperature ≥ 60°C), • orange LED : internal power supply absent in the protection system card. NOTE: The PCL «AMPLIFIERS» window displays the status conditions of a power amplifier as follows : T1 • transistor current values: T2 - T1 : amplifier modules 1 and 2, T6 T5 T3 - T2 : amplifier modules 3 and 4, - T3 : amplifier modules 5 and 6, T4 - T4 : amplifier modules 7 and 8, - T5 : transistors in class AB drive amplifier, - T6 : transistors in class A preamplifier, • ON, • general fault, • SWR fault, • overdrive fault, • internal temperature fault, • presence/absence. 9946 V1 45321648.01 Numéro / Number 104 Doc. preliminary Rev. Langu. 16/06/2006 85 / 131 Page
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